// @ts-nocheck
import { saveAs } from 'file-saver';
import * as XLSX from 'xlsx';

function generateArray(table) {
	const out = [];
	const rows = table.querySelectorAll('tr');
	const ranges = [];
	for (let R = 0; R < rows.length; ++R) {
		const outRow = [];
		const row = rows[R];
		const columns = row.querySelectorAll('td');
		for (let C = 0; C < columns.length; ++C) {
			const cell = columns[C];
			let colspan = cell.getAttribute('colspan');
			let rowspan = cell.getAttribute('rowspan');
			let cellValue = cell.innerText;
			if (cellValue !== '' && cellValue == +cellValue) cellValue = +cellValue;

			//Skip ranges
			ranges.forEach(function (range) {
				if (
					R >= range.s.r &&
					R <= range.e.r &&
					outRow.length >= range.s.c &&
					outRow.length <= range.e.c
				) {
					for (let i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
				}
			});

			//Handle Row Span
			if (rowspan || colspan) {
				rowspan = rowspan || 1;
				colspan = colspan || 1;
				ranges.push({
					s: {
						r: R,
						c: outRow.length
					},
					e: {
						r: R + rowspan - 1,
						c: outRow.length + colspan - 1
					}
				});
			}

			//Handle Value
			outRow.push(cellValue !== '' ? cellValue : null);

			//Handle Colspan
			if (colspan) for (let k = 0; k < colspan - 1; ++k) outRow.push(null);
		}
		out.push(outRow);
	}
	return [out, ranges];
}

function datenum(v, date1904) {
	if (date1904) v += 1462;
	const epoch = Date.parse(v);
	return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000);
}

function sheet_from_array_of_arrays(data, opts) {
	const ws = {};
	const range = {
		s: {
			c: 10000000,
			r: 10000000
		},
		e: {
			c: 0,
			r: 0
		}
	};
	for (let R = 0; R != data.length; ++R) {
		for (let C = 0; C != data[R].length; ++C) {
			if (range.s.r > R) range.s.r = R;
			if (range.s.c > C) range.s.c = C;
			if (range.e.r < R) range.e.r = R;
			if (range.e.c < C) range.e.c = C;
			const cell = {
				v: data[R][C]
			};
			if (cell.v == null) continue;
			const cell_ref = XLSX.utils.encode_cell({
				c: C,
				r: R
			});

			// 修改这里：无论原始类型是什么，都将单元格类型设置为 "s"
			cell.t = 's';

			ws[cell_ref] = cell;
		}
	}
	if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range);
	return ws;
}

function Workbook() {
	if (!(this instanceof Workbook)) return new Workbook();
	this.SheetNames = [];
	this.Sheets = {};
}

function s2ab(s) {
	const buf = new ArrayBuffer(s.length);
	const view = new Uint8Array(buf);
	for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xff;
	return buf;
}

export function export_table_to_excel(id) {
	const theTable = document.getElementById(id);
	const oo = generateArray(theTable);
	const ranges = oo[1];

	/* original data */
	const data = oo[0];
	const ws_name = 'SheetJS';

	const wb = new Workbook(),
		ws = sheet_from_array_of_arrays(data);

	/* add ranges to worksheet */
	// ws['!cols'] = ['apple', 'banan'];
	ws['!merges'] = ranges;

	/* add worksheet to workbook */
	wb.SheetNames.push(ws_name);
	wb.Sheets[ws_name] = ws;

	const wbout = XLSX.write(wb, {
		bookType: 'xlsx',
		bookSST: false,
		type: 'binary'
	});

	saveAs(
		new Blob([s2ab(wbout)], {
			type: 'application/octet-stream'
		}),
		'test.xlsx'
	);
}

export function export_json_to_excel({
	multiHeader = [],
	header,
	data,
	filename,
	merges = [],
	autoWidth = true,
	bookType = 'xlsx'
} = {}) {
	/* original data */
	filename = filename || 'excel-list';
	data = [...data];
	data.unshift(header);

	for (let i = multiHeader.length - 1; i > -1; i--) {
		data.unshift(multiHeader[i]);
	}

	const ws_name = 'SheetJS';
	const wb = new Workbook(),
		ws = sheet_from_array_of_arrays(data);

	if (merges.length > 0) {
		if (!ws['!merges']) ws['!merges'] = [];
		merges.forEach(item => {
			ws['!merges'].push(XLSX.utils.decode_range(item));
		});
	}

	if (autoWidth) {
		/*设置worksheet每列的最大宽度*/
		const colWidth = data.map(row =>
			row.map(val => {
				/*先判断是否为null/undefined*/
				if (val == null) {
					return {
						wch: 10
					};
				} else if (val.toString().charCodeAt(0) > 255) {
					/*再判断是否为中文*/
					return {
						wch: val.toString().length * 2
					};
				} else {
					return {
						wch: val.toString().length
					};
				}
			})
		);
		/*以第一行为初始值*/
		const result = colWidth[0];
		for (let i = 1; i < colWidth.length; i++) {
			for (let j = 0; j < colWidth[i].length; j++) {
				if (result[j]['wch'] < colWidth[i][j]['wch']) {
					result[j]['wch'] = colWidth[i][j]['wch'];
				}
			}
		}
		ws['!cols'] = result;
	}

	/* add worksheet to workbook */
	wb.SheetNames.push(ws_name);
	wb.Sheets[ws_name] = ws;

	const wbout = XLSX.write(wb, {
		bookType: bookType,
		bookSST: false,
		type: 'binary'
	});
	saveAs(
		new Blob([s2ab(wbout)], {
			type: 'application/octet-stream'
		}),
		`${filename}.${bookType}`
	);
}
